The United State's Toxics Release Inventory (TRI) is one of several
similar programs established, or being established, by countries
around the world. The term used internationally for these TRI-like
systems is Pollutant Release and Transfer Register (PRTR). PRTRs
are the most comprehensive of a type of environmental program called
emission inventories. Nations with emission inventories collect
data on releases to one or more environmental media (air, water,
land), thus gathering a subset of the data that is gathered under
a PRTR system.